Being a simple kind of guy, I think the single most important rule is:
You can do anything you want to the neck and shoulder, NEVER heat up the base! Heated base equal sudden pressure release into your face.
Under heat and minimum to no affect
Overheat it and never going to bounce back (though you may be happy in your ignorance)
But neither is dangerous, and its better to be disappointed than injured or dead. Trust me, been there (injured) , done that (tried to die) carloads of T shirts.
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